This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 54 |
| 4 | 24 |
| 5 | 180 |
| 6 | 216 |
| 7 | 546 |
| 8 | 336 |
| 9 | 648 |
| 10 | 720 |
| 11 | 990 |
| 12 | 936 |
| 13 | 1404 |
| 14 | 2352 |
| 15 | 1890 |
| 16 | 1824 |
| 17 | 2448 |
| 18 | 2592 |
| 19 | 3078 |
| 20 | 3720 |
| 21 | 4284 |
| 22 | 3960 |
| 23 | 4554 |
| 24 | 4464 |
| 25 | 5400 |
| 26 | 5616 |
| 27 | 6318 |
| 28 | 7896 |
| 29 | 7308 |
| 30 | 7560 |
| 31 | 8370 |
| 32 | 8256 |
| 33 | 9504 |
| 34 | 9792 |
| 35 | 11550 |
| 36 | 10584 |
| 37 | 11988 |
| 38 | 12312 |
| 39 | 13338 |
| 40 | 14640 |
| 41 | 14760 |
| 42 | 17640 |
| 43 | 16254 |
| 44 | 16104 |
| 45 | 17820 |
| 46 | 18216 |
| 47 | 19458 |
| 48 | 19296 |
| 49 | 22344 |
| 50 | 21600 |